Apparatus for preventing malfunction at time of duplex unit fail

Details Apparatus for preventing malfunction at time of duplex unit fail Apparatus for preventing malfunction at time of duplex unit fail

1997-05-12

1999-09-28

Beausoliel, Jr., Robert W.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

714 2, 714 13, 714 22, 714 48, G06F 1116

Patent

active

059580690

ABSTRACT:
A system includes a host, first and second devices which operate as an acting device and a standby device, and a simplex unit controlled by the acting device. Each device is provided with a monitoring unit for monitoring the occurrence of failure, means for notifying the other device of a failure in its own device, and active/standby notification means. The active/standby notification means notifies the simplex unit that its own device is acting or standing by when the device becomes the acting device or standby device in response to a command from the host. Upon a failure in the other device when its own device is standing by, the active/standby notification means notifies the simplex unit that its own device is now an apparent acting device. Upon a failure in its own device when its own device is acting, the active/standby notification means notifies the simplex unit that its own device is now an apparent standby device. The simplex unit executes predetermined control upon accepting control data from the apparent acting device.

REFERENCES:
patent: 3757302 (1973-09-01), Pollitt
patent: 3860914 (1975-01-01), Zitelli et al.
patent: 4455601 (1984-06-01), Griscom et al.
patent: 5504859 (1996-04-01), Gustafson et al.
patent: 5544304 (1996-08-01), Carlson et al.

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